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  #16  
Old 04-04-2012, 10:23 AM
johnfischer johnfischer is offline
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Default Re: '99 XLT 3.0 Coolant over heating

Once it cools down here I'm going to go check it out.
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  #17  
Old 04-05-2012, 12:08 PM
johnfischer johnfischer is offline
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Default Re: '99 XLT 3.0 Coolant over heating

Quote:
Originally Posted by kennypowers View Post
After you drive it does the coolant reservoir bubble? or fill up and pop the cap off when your driving?

East Bound and Down
So I looked over every thing this afternoon. I hadn't seen any sign's of the reservoir cap blowing off, until today. The cap was loose but I didn't notice any thing wrong. That is until I noticed a little bit of coolant resting on the out side of the reservoir.

That's all for now.
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  #18  
Old 04-05-2012, 12:55 PM
BILLIBOY BILLIBOY is offline
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Default Re: '99 XLT 3.0 Coolant over heating

It can't be the heater core. Sounds like air getting into the cooling system from a small leak from a head gasket or cracked head. The heater blows cool air when there is air in the heater core instead of coolant. The air had to come from somewhere.
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  #19  
Old 04-05-2012, 04:21 PM
johnfischer johnfischer is offline
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Default Re: '99 XLT 3.0 Coolant over heating

If I had a cracked gasket or head wouldn't I see oil in the coolant?
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  #20  
Old 04-05-2012, 04:38 PM
nicktheman2013 nicktheman2013 is offline
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There would be a whitefish substance in your oil and the coolant reservoir would be bubbling if you had a cracked head gasket

----------

Whitesh*
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  #21  
Old 04-05-2012, 05:43 PM
kennypowers kennypowers is offline
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Try smelling your coolant reservoir you might be able to smell some exhaust gasses

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  #22  
Old 04-05-2012, 07:20 PM
johnfischer johnfischer is offline
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Default Re: '99 XLT 3.0 Coolant over heating

Well I drove it all around tonight and noticed some thing.

I smelled the coolant, but didn't smell any exhaust in it. I changed the oil the other week but didn't notice white-ish(whitefish ) stuff in it.

Ok so about this evening. My wife and I were driving around and watched the water temp rise to normal and stay steady, but there was no heat what so ever for a few minutes. Then it started to flux lukewarm to cold and so on for the rest of that drive. We went to a store shut down and went in for about 30 min. Came back out started up and drove off noticing that the temp rose to normal and stayed there. So I tested the heat again, and it was full bore hot. The rest of the drive the water temp stayed in the normal all the way until I was backing into my parking spot and it started to rise to hot again.

To me it sounds like I have a bubble circulating that I need to get out of the system, but more importantly find the leak that's letting it in.
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  #23  
Old 04-05-2012, 08:00 PM
FireRanger FireRanger is offline
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Or like I said several days ago..........

Quote:
Originally Posted by FireRanger
If you are getting heat under normal conditions, then you have no business replacing the heater core. Please don't ruin your life for an entire day doing that. First go look at the coolant level on a cold engine to make sure it is full. Presuming it is full, it is probably a bad water pump. When the impeller wears out, it just cavitates at high RPM and doesn't pump water.
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  #24  
Old 04-10-2012, 01:41 PM
johnfischer johnfischer is offline
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Since the previous owner mixed coolants and really mucked things up with that, I'm going to break down and buy the following.

1) radiator
2) heater core
3) water pump
4) Thermostat
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  #25  
Old 04-10-2012, 02:53 PM
FireRanger FireRanger is offline
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Default Re: '99 XLT 3.0 Coolant over heating

Quote:
Originally Posted by johnfischer View Post
2) heater core
WHY do you want to waste an entire weekend replacing something that is not broken.
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  #26  
Old 04-10-2012, 03:15 PM
johnfischer johnfischer is offline
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The previous owner had mixed reg green coolant with something like dex cool, this has a reaction and makes mud like material. I can see it in the radiator and since I've been flushing the system with peak flush/cleaner it's bee scavenging quite a bit of "mud". So I'm thinking that if it's in the radiator then it's gotta be in the heater core as well.

So if I'm going to do all the other work, why not spend a day and have an almost perfectly clean system.
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  #27  
Old 04-10-2012, 03:22 PM
FireRanger FireRanger is offline
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Default Re: '99 XLT 3.0 Coolant over heating

You might change your mind when you see what is involved with changing the heater core. You said it was working find and you were getting heat. If you want to, knock yourself out I guess.
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  #28  
Old 04-10-2012, 03:28 PM
johnfischer johnfischer is offline
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Yeah, now I'm getting mixed results with normal heat. I would just feel better replacing it. Who knows maybe I'll just have a shop replace that piece.
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  #29  
Old 11-09-2012, 05:19 PM
johnfischer johnfischer is offline
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Default Re: '99 XLT 3.0 Coolant over heating

I know it's been quite some time, but I figured I'd come back and let ya'll know how it's going. I finally had some time out of my busy schedule to work on the truck. I took your advice FireRanger and didn't buy the heater core. But I did buy a New (not re-maned) water pump. Look at the pictures and you'll see. I bought this truck not quite a year ago so I'm assuming that this was the original water pump from the factory.





Well needless to say there is no more overheating problem for me. Thanks for all the help and ideas guys I really appreciate it.

John
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